78404131 has 8 divisors (see below), whose sum is σ = 86232384. Its totient is φ = 70832640.

The previous prime is 78404129. The next prime is 78404149. The reversal of 78404131 is 13140487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78404131 - 2¹ = 78404129 is a prime.

It is a super-2 number, since 2×78404131² = 12294415515730322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78404131.

It is not an unprimeable number, because it can be changed into a prime (78404101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63550 + ... + 64771.

It is an arithmetic number, because the mean of its divisors is an integer number (10779048).

Almost surely, 2^78404131 is an apocalyptic number.

78404131 is a deficient number, since it is larger than the sum of its proper divisors (7828253).

78404131 is a wasteful number, since it uses less digits than its factorization.

78404131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128381.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 78404131 is about 8854.6107198453. The cubic root of 78404131 is about 428.0025093020.

The spelling of 78404131 in words is "seventy-eight million, four hundred four thousand, one hundred thirty-one".